html {
    height: 100%;
  }
  
  html body {
    height: 100%;
    background-image: url(../img/beijing.png);
    background-size: cover;
    position: relative;
  }
  
.box {
    position: absolute;
    top: 50%;
    left: 50%;
    background-color:rgba(256,256,256,0.5);
    width: 20%;
    border-radius: 10px;
    transform: translate(-50%, -50%);
  }
  
.box form input{
    height: 30px;
    width: 150px;
    font-size: 14px;
    border-radius: 10px;
    padding-left: 10px;
    outline: none;
    border: solid 1px goldenrod; 
    

  }
  
.box form input[type='submit'],
.box form button {
    padding-left: 0;
    cursor: pointer;
  }
.control {
    margin: 10px 0;
    text-align: center;
    
  }
  
.control input[type='reset'] {
    background-color: #ccc;
    margin-left: 30%;
    width: 30%;
  }
  
.control input[type='submit'] {
    color: #fff;
    background-color: goldenrod;
    border-color: goldenrod;
    width: 40%;
  }
#yy{
    background-color: white;
    border: solid 1px white;
    color: black;
  } 
#img{
    width: 240px;
    height: 40px;
}
#wb{
  width: 80%;
  height: 40px;
  border: solid 1px goldenrod;
  border-radius: 10px;
  margin: 0 auto;
}
  